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Stock-based Compensation - Restricted Stock and Stock Options (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Shares          
Total stock-based compensation expense $ 2,228,000 $ 4,802,000 $ 7,871,000 $ 17,397,000  
Restricted Stock Unit Awards          
Shares          
Unvested restricted stock unit awards, beginning of period (in shares)     2,326,523    
Issued (in shares)     1,560    
Vested (in shares)     (436,186)    
Forfeited (in shares)     (1,239,630)    
Unvested restricted stock unit awards, end of period (in shares) 652,267   652,267   2,326,523
Weighted Average Grant Date Fair Value Per Share          
Balance, beginning of period (in dollars per share)     $ 9.78    
Issued (in dollars per share)     1.26    
Vested (in dollars per share)     10.30    
Forfeited (in dollars per share)     9.99    
Balance, ending of period (in dollars per share) $ 9.12   $ 9.12   $ 9.78
Unrecognized stock-based compensation expense $ 3,200,000   $ 3,200,000    
Period for recognition     1 year 7 months 24 days    
Performance Shares | Share-Based Payment Arrangement, Employee          
Shares          
Issued (in shares)     0    
Total stock-based compensation expense 0 $ 0 $ 0 $ 3,500,000  
Stock Options          
Weighted Average Grant Date Fair Value Per Share          
Unrecognized stock-based compensation expense $ 11,300,000   $ 11,300,000    
Period for recognition     2 years 6 months    
Shares          
Outstanding, beginning of period (in shares)     7,656,010    
Granted (in shares)     5,732,792    
Exercised (in shares)     (12,130)    
Cancelled (in shares)     (4,395,961)    
Outstanding, end of period (in shares) 8,980,711   8,980,711   7,656,010
Exercisable (in shares) 3,941,705   3,941,705    
Weighted Average Exercise Price          
Outstanding, beginning of period (in dollars per share)     $ 14.70    
Granted (in dollars per share)     1.74    
Exercised (in dollars per share)     1.72    
Cancelled (in dollars per share)     9.91    
Outstanding, end of period (in dollars per share) $ 8.81   8.81   $ 14.70
Exercisable (in dollars per share) $ 15.73   $ 15.73    
Stock Options Additional Disclosures          
Remaining contractual life (years)     7 years 5 months 8 days   7 years 2 months 8 days
Exercisable, remaining contractual life     5 years 4 months 28 days    
Aggregate intrinsic value $ 7,553,000   $ 7,553,000   $ 0
Exercisable, aggregate intrinsic value $ 818,000   $ 818,000